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Finding the Fourth Proportional to 396.78, 550.10 and 374.90

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Solution

The fourth proportional to 396.78, 550.10 and 374.90 is: 519.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.78 : 550.10 = 374.90 : x
  2. Step 2: Convert to fraction form
    396.78/550.10 = 374.90/x
  3. Step 3: Cross multiply
    396.78x = 550.10 × 374.90
  4. Step 4: Simplify right side
    396.78x = 206,232.49
  5. Step 5: Solve for x
    x = 206,232.49/396.78
  6. Step 6: Final answer
    x = 519.77

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Find fourth proportional to 198.39, 275.05 and 187.45
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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.